The ICM Registry is the company responsible for managing .XXX domain names, which were introduced to the public in 2011.
Companies and trademark holders were given the opportunity to reserve their trademarks and brands, which would prevent anyone from using those domain names. Domain names that were reserved during this time period do not resolve, and they will not ever resolve.
Many domain names were specifically reserved by the ICM Registry, preventing anyone from purchasing these domain names. Some of these names were reserved for private auctions, which will be held at later dates, and others were reserved to prevent their registration. Some of these are religious domain names, geographic domain names, and other types of names.
Domain names that are reserved by ICM do resolve, but they feature a message on them: “This domain has been reserved from registration.” Inquiries about these domain names should be directed to the ICM Registry.